A boat carrying migrants has sunk as it tried to cross the Mediterranean from Tunisia to Italy, with 13 of those on board missing. Tunisia was ‌once a major departure point for migrants crossing the Mediterranean, but departures have fallen sharply over the past two years amid a crackdown ‌and tighter maritime controls, backed by European ​funding and modern border-monitoring equipment, particularly from Italy. Key points and original sources are listed below.

• A boat carrying migrants has sunk as it tried to cross the Mediterranean from Tunisia to Italy, with 13 of those on board missing.S1

• Tunisia was ‌once a major departure point for migrants crossing the Mediterranean, but departures have fallen sharply over the past two years amid a crackdown ‌and tighter maritime controls, backed by European ​funding and modern border-monitoring equipment, p...S2